Books like Alien Sex
Ellen Datlow, Leigh Kennedy, Rick Wilber, Harlan Ellison, Scott Baker, Larry Niven, K. W. Jeter, Philip José Farmer, Lisa Tuttle, Bruce McAllister, Edward Bryant, Pat Cadigan, Geoff Ryman, Connie Willis, Richard Christian Matheson, Lewis Shiner, Roberta Lannes, James Tiptree, Jr., Michaela Roessner, Pat Murphy
Alien Sex is 287 pages, about 5 hours 16 minutes at 250 words a minute.
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My Secret Life 9.4 h 
Chocolate Flava 6.3 h 
Pleasure Beach 6.5 h 
Children of Dune 9.2 h 
Memoirs of Fanny Hill 4.1 h 
Pure Sex 5.2 h Bar height shows length. Estimated at 250 words a minute.